KR20040049143A - Organic electroluminescence device - Google Patents

Abstract

PURPOSE: An organic electro-luminescence device is provided to enhance the luminance and the contrast and improve the picture quality by approaching the intensity of optical interference of red, green, and blue colors to a peak value. CONSTITUTION: An organic electro-luminescence device includes a transparent substrate, a first electrode part, an organic layer, and a second electrode. The first electrode part includes a first electrode. The first electrode is formed by patterning an upper surface of the transparent substrate(11). The organic layer(15) is formed by laminating a hole injecting layer, a hole transporting layer, an emitting layer, and an electron transporting layer on an upper surface of the first electrode part. The second electrode(17) is formed on an upper surface of the organic layer. A gap between the upper surface of the transparent substrate and an upper surface of the first electrode part and a thickness ratio of the organic layer are determined by a predetermined mathematical expression.

Description

Organic electroluminescence device

The present invention relates to an organic electroluminescent device, and more particularly, to an organic electroluminescent device in which the intensity of each light becomes a peak.

Electroluminescent display devices are classified into inorganic electroluminescent devices and organic electroluminescent devices according to materials that form an emitter layer.

In the organic electroluminescent device, electrons and holes supplied from the outside combine and disappear in the light emitting layer to form an exciton, and the excitons transition from the excited state to the ground state, transferring energy to the fluorescent component of the light emitting layer and emitting light. An image is formed.

The organic electroluminescent device has an advantage of excellent luminance, driving voltage and response speed, and multi-coloration, compared to the inorganic electroluminescent device. In addition, the organic light emitting display device has attracted attention as a next generation display device because of its advantages of having a wide viewing angle, excellent contrast, and fast response speed.

A general organic electroluminescent device includes a positive electrode layer formed in a predetermined pattern on a substrate, a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer sequentially stacked on the positive electrode layer, and the positive electrode layer on an upper surface of the electron transport layer. A negative electrode layer having a predetermined pattern formed in a direction orthogonal to is provided. The hole transport layer, the light emitting layer and the electron transport layer are organic thin films made of an organic compound.

In the conventional organic light emitting display device, the maximum luminous efficiency and luminance were obtained by controlling the thickness of the organic thin films. For example, the electroluminescent device disclosed in Japanese Patent Laid-Open No. 4-137485 intends to improve luminous efficiency by setting the film thickness of the electron transport layer to 30 to 60 nm.

Among the organic light emitting diodes, a multicolor or full color organic light emitting diode is manufactured by using a white light and a color filter, a blue light and a color changing medium (CCM), red, green, and blue. There is a method of separately depositing a light emitting material (hereinafter referred to as RGB tricolor independent emission method), and RGB tricolor independent emission method is known to have the best luminous efficiency.

In the conventional RGB tricolor organic light emitting device, a technique of changing the thickness by patterning the organic layer of each of the red, green, and blue pixels so that a peak of the optical interference intensity of each of the red, green, and blue light occurs. use. However, due to this, when the organic layer is thick, the luminous efficiency is lowered, and there is a disadvantage in that a high driving voltage is applied to compensate for this. Further, in the related art, the thickness of the organic layer is adjusted without considering the peaks of the red, green, and blue light peaks, thereby manufacturing an organic light emitting diode having low luminous efficiency.

Accordingly, an object of the present invention is to improve the above-described problems of the related art, and an object of the present invention is to provide an organic light emitting display device in which optical interference intensity of red, green, and blue light peaks.

1A is a perspective view of an organic electroluminescent device according to a first embodiment of the present invention;

1B is a cross-sectional view of an organic electroluminescent device according to a first embodiment of the present invention;

2A is a cross-sectional view of an organic electroluminescent device according to a second embodiment of the present invention;

2B is a cross-sectional view of an organic electroluminescent device according to a third embodiment of the present invention;

2C is a cross-sectional view of an organic electroluminescent device according to a fourth embodiment of the present invention;

3A is a cross-sectional view of an organic electroluminescent device according to a fifth embodiment of the present invention;

3B is a cross-sectional view of an organic electroluminescent device according to a sixth embodiment of the present invention;

3C is a cross-sectional view of an organic electroluminescent device according to a seventh embodiment of the present invention;

3D is a cross-sectional view of an organic electroluminescent device according to an eighth embodiment of the present invention;

4 is a graph showing a change in the intensity of light of red, green, and blue according to the thickness change of ITO in the organic electroluminescent device according to the first embodiment of the present invention, when the thickness of the organic layer is constant;

FIG. 5 is a graph showing a change in intensity of light of red, green, and blue according to the thickness change of ITO when the sum of the thickness of the hole injection layer and the hole transport layer is constant in the organic electroluminescent device according to the first embodiment of the present invention. ,

6A to 6I are process charts showing an example of an electrode manufacturing method of an organic electroluminescent device according to a first embodiment of the present invention;

7A to 7O are process charts showing another example of the electrode manufacturing method of the organic electroluminescent device according to the first embodiment of the present invention.

<Description of reference numerals for main parts of the drawings>

11, 21, 71, 81; Substrates 12 and 36; Buffer layer

13, 23; First electrodes 15 and 25; Organic layer

17, 27; Second electrode 30; Insulation layer

37; Planarization film 41; Semiconductor layer

43; Gate electrode 45; Drain electrode

47; Source electrode 51; Third electrode

53; Fourth electrodes 73 and 83; electrode

The present invention to achieve the above technical problem,

A first electrode part comprising a transparent substrate; and a transparent first electrode formed on a top surface of the transparent substrate in a predetermined pattern; and a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer in order on the top surface of the first electrode part. An organic layer laminated; And a second electrode formed on a top surface of the organic layer in a predetermined pattern.

The ratio between the distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion and the thickness of the organic layer satisfies Equation 1 such that the intensity of the red, green, and blue light peaks. To provide.

The present invention also to achieve the above technical problem,

A first electrode portion including a transparent substrate; and a transparent first electrode formed on a top surface of the transparent substrate in a predetermined pattern; and a hole injection layer, a hole transfer layer, a light emitting layer, and an electron transfer layer on the top surface of the first electrode portion in order. A pixel portion including a stacked organic layer and a second electrode portion formed in a predetermined pattern on an upper surface of the organic layer; And a driving part including a thin film transistor for driving the first electrode.

The ratio between the distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion and the thickness of the organic layer satisfies Equation 1 such that the intensity of red, green, and blue light peaks. To provide.

The first electrode part may further include a transparent buffer layer having a refractive index similar to that of the first electrode on a bottom surface of the first electrode.

When the organic layer has a thickness of 140 ± 10 nm,

The distance from an upper surface of the transparent substrate to an upper surface of the first electrode portion may have a thickness of 295 ± 10 nm such that the intensity of the red light becomes a peak, or a thickness of 225 ± 10 nm so that the intensity of the green light becomes a peak. Or, it is preferable to have a thickness of 155 ± 10 nm so that the intensity of the blue light becomes a peak.

The present invention also to achieve the above technical problem,

A first electrode formed in a predetermined pattern on an upper surface of the substrate, and an organic layer in which a hole injection layer, a hole transport layer, an emission layer, and an electron transport layer are sequentially stacked on an upper surface of the first electrode; And a second electrode part including a transparent second electrode formed in a predetermined pattern on an upper surface of the organic layer.

The ratio of the distance from the upper surface of the organic layer to the upper surface of the second electrode portion, and the thickness of the organic layer satisfies Equation 2 so that the intensity of the red, green, and blue peaks to provide an organic electroluminescent device do.

The present invention also to achieve the above technical problem,

A first electrode formed in a predetermined pattern on the upper surface of the substrate, an organic layer in which a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are sequentially stacked on the upper surface of the first electrode, and an upper surface of the organic layer. A pixel portion including a second electrode portion including a transparent second electrode formed in a predetermined pattern on the substrate; And a driving unit including a thin film transistor for driving the second electrode.

The ratio of the distance from the top surface of the organic layer to the top surface of the second electrode portion, and the thickness of the organic layer satisfies Equation 2 so that the intensity of the red, green, blue light peaks. do.

The second electrode part may further include a transparent buffer layer having a refractive index similar to that of the second electrode on an upper surface of the second electrode.

When the organic layer has a thickness of 140 ± 10 nm,

The distance from an upper surface of the transparent substrate to an upper surface of the first electrode portion may have a thickness of 295 ± 10 nm such that the intensity of the red light becomes a peak, or a thickness of 225 ± 10 nm so that the intensity of the green light becomes a peak. Or, it is preferable to have a thickness of 155 ± 10 nm so that the intensity of the blue light becomes a peak.

The present invention also, in order to achieve the above technical problem,

A first electrode part comprising a transparent substrate; and a transparent first electrode formed on a top surface of the transparent substrate in a predetermined pattern; and a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer in order on the top surface of the first electrode part. An organic layer laminated; And a second electrode formed on a top surface of the organic layer in a predetermined pattern.

The ratio of the distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion and the sum of the thicknesses of the hole injection layer and the hole transport layer satisfies Equation 3 such that the intensity of red, green, and blue light becomes a peak. An organic electroluminescent device is provided.

The present invention also to achieve the above technical problem,

A first electrode portion including a transparent substrate; and a transparent first electrode formed on a top surface of the transparent substrate in a predetermined pattern; and a hole injection layer, a hole transfer layer, a light emitting layer, and an electron transfer layer on the top surface of the first electrode portion in order. A pixel portion including a stacked organic layer and a second electrode portion formed in a predetermined pattern on an upper surface of the organic layer; And a driving part including a thin film transistor for driving the first electrode.

The ratio between the distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion and the thickness of the organic layer satisfies Equation 3 such that the intensity of red, green, and blue light peaks. To provide.

The first electrode unit may further include a transparent buffer layer having a refractive index similar to that of the first electrode on a bottom surface of the first electrode.

When the sum of the thicknesses of the hole transport layer and the hole injection layer has a thickness of 80 ± 10 nm,

The distance from the top surface of the transparent substrate to the top surface of the first electrode portion is 265 ± 10 nm so that the intensity of the red light peaks, or 205 ± 10 nm so that the intensity of the green light peaks, or the intensity of the blue light peaks As much as 155 ± 10 nm.

The present invention also, in order to achieve the above technical problem,

A first electrode formed in a predetermined pattern on an upper surface of the substrate, and an organic layer in which a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are sequentially stacked on an upper surface of the first electrode; and an upper surface of the organic layer And a second electrode part including a transparent second electrode formed in a predetermined pattern on the

The ratio of the distance from the upper surface of the organic layer to the upper surface of the second electrode portion and the sum of the thicknesses of the hole injection layer and the hole transport layer satisfies Equation 4 such that the intensity of red, green, and blue light becomes a peak. An organic electroluminescent device is provided.

The present invention also to achieve the above technical problem,

A first electrode formed in a predetermined pattern on the upper surface of the substrate, an organic layer in which a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are sequentially stacked on the upper surface of the first electrode, and an upper surface of the organic layer. A pixel portion including a second electrode portion including a transparent second electrode formed in a predetermined pattern on the substrate; And a driving unit including a thin film transistor for driving the second electrode.

The ratio of the distance from the upper surface of the organic layer to the upper surface of the second electrode portion and the sum of the thicknesses of the hole injection layer and the hole transport layer satisfies Equation 4 such that the intensity of red, green, and blue becomes a peak. An organic electroluminescent device is provided.

The second electrode part may further include a transparent buffer layer having a refractive index similar to that of the second electrode on an upper surface of the second electrode.

When the sum of the thicknesses of the hole transport layer and the hole injection layer has a thickness of 80 ± 10 nm,

The distance from the top surface of the transparent substrate to the top surface of the first electrode portion is 265 ± 10 nm so that the intensity of the red light peaks, or 205 ± 10 nm so that the intensity of the green light peaks, or the intensity of the blue light peaks As much as 155 ± 10 nm.

According to the present invention, the distance from the top surface of the substrate to the top surface of the first electrode in the case of the bottom emission method, or the distance from the top surface of the organic layer to the top surface of the second electrode in the case of the bottom emission mode and the thickness of the organic layer within a predetermined range. By setting so as to have a high luminous efficiency can be obtained by setting the intensity of each of the red, green, and blue light peaks.

Hereinafter, an organic electroluminescent device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, it should be noted that each thickness of the organic electroluminescent device according to the embodiment of the present invention is exaggerated for explanation.

<First embodiment of the present invention>

1 is a perspective view showing an organic electroluminescent device according to a first embodiment of the present invention.

The organic electroluminescent device according to the first embodiment of the present invention is a rear light emitting organic electroluminescent device of the passive matrix method, and the thickness of the first electrode 13 is applied to the pixel from which the red, green, and blue light is emitted. Therefore, it is changing to d1, d2 and d3 respectively.

Referring to the drawings, the organic electroluminescent device according to the first embodiment of the present invention, the substrate 11, the first electrode formed in a stripe shape to have a different thickness for each pixel on the substrate 11 ( 13), the organic layer 15 stacked on the first electrode 13 and the second electrode 17 stacked on the organic layer 15 and formed in a stripe shape so as to intersect the first electrode 13. ) In order.

Reference numeral 18 is an insulating layer that serves as an insulating wall so that each pixel emits different color light by insulating the first electrode 13 and the second electrode 17. It is formed orthogonal to this first electrode 13 so as to be regularly exposed. In this case, the first electrode 23 generally functions as an anode and the second electrode 27 functions as a cathode.

The first electrode 13 is made of a transparent conductive material, and in the case of pixels emitting red light, three layers 13a, 13b, and 13c, and in the case of pixels emitting green light, two layers 13a and 13b, and blue light. In the case of emitting pixels, the pixels are stacked in one layer 13a.

Since the light emitting layer is filled by the anode and the cathode positioned at the top and the bottom of the electroluminescent device, either side of the top or bottom of the organic layer 15 should be transparent to emit light to display an image.

For example, when the organic electroluminescent device is a back light emitting method, since the substrate 11 and the first electrode 13 are transparent, light generated in the organic layer 15 passes through the first electrode 13 and the substrate to the outside. When the organic electroluminescent device is a top emission type, the second electrode 11 is transparent and the substrate 11 and the first electrode 13 are opaque so that the light generated in the organic layer 15 is the second electrode. It penetrates 17.

In the organic light emitting device of the back emission type, the substrate 11 and the first electrode 13 should be made of a material having high light transmittance. In the organic light emitting device of the top emission type, the second electrode 17 has a light transmittance. It must be made of this high material. In general, the substrate 11 is made of glass, and the transparent electrode 13 is made of indium tin oxide (ITO). Recently, CdSnO ₃ , ZnO, and the like have attracted attention as transparent electrodes 13.

FIG. 2A is a cross-sectional view of an organic electroluminescent device in a direction A-A 'according to a first embodiment of the present invention shown in FIG. 1.

The thickness of the first electrode 13 of the organic electroluminescent device according to the first embodiment of the present invention is changed to d1, d2, d3 according to each color light. The thickness of the first electrode 13 of the pixel from which the red light is emitted (hereinafter referred to as the red pixel) is d1, the thickness of the first electrode of the pixel from which the green light is emitted (the green pixel) is d2, and the pixel from which the blue light is emitted (blue) The thickness of the first electrode of the pixel) is set to d3, and when the thickness of the organic layer is S, the thickness of the first electrode is manufactured to satisfy the formula (1) so that the intensities of the red, green, and blue light peak.

In Equation 1, the distance from the top surface of the transparent substrate 11 to the top surface of the first electrode 13 is the thickness d1, of the first electrode 13 in the organic electroluminescent device according to the first embodiment of the present invention. d2, d3), so that Equation 5 is satisfied.

The organic layer 15 has a thickness s and includes a hole injecting layer (HIL) 15a, a hole transporting layer (HTL) 15b, into which holes are injected, as described above. An emission layer (EML) 15c and an electron transporting layer (ETL) 15c are formed.

Holes injected from the hole transport layer 15b and electrons injected from the electron transport layer 15c meet and disappear in the light emitting layer 15c, thereby transferring energy to the fluorescent material to emit light. The emitted light is divided into visible rays representing each color of red (640 nm to 780 nm), green (490 nm to 550 nm), and blue (430 nm to 490 nm) according to the wavelength band. The colors are designed to be different.

In the organic electroluminescent device according to the first embodiment of the present invention, the organic electroluminescent device having the predetermined thickness (s) to satisfy the thickness ratio of the first electrode 13 and the organic layer 15 as shown in Equation 5 The thickness of one electrode 13 is changed to d1, d2 and d3 according to the pixels of red, green and blue light. An organic electroluminescent device according to a first embodiment of the present invention having the conditions shown in Table 1 for the experiment on the optimum thickness is manufactured.

Board First electrode Organic layer Thickness (mm) Refractive index Thickness (mm) Refractive index HIL + HTL EML + ETL Refractive index Thickness (nm) Thickness (nm) Red 0.7 1.516 1.749 80 60 1.785 Green 0.7 1.520 1.841 80 60 1.821 blue 0.7 1.526 1.903 80 60 1.916

In this experiment, the optical interference intensity of red, green, and blue light is found while making the thickness s of the organic layer 15 constant at 140 nm and changing the thickness of the first electrode 13.

4 shows a graph showing the results of this experiment.

Referring to FIG. 4, when ITO (Indium Tin Oxide) is used as the first electrode 13, the interference intensity of each light changes with a sine wave depending on the thickness (nm) of the ITO. As shown, the intensity of blue light shows a peak when the thickness of ITO is about 30 nm, about 155 nm, and about 290 nm, and the interference intensity of green light shows a peak when the thickness of ITO is about 75 nm, about 225 nm, and about 370 nm. In the case where the thickness of ITO is about 120 nm and about 295 nm, red light shows a peak.

In order to facilitate the manufacture of an organic electroluminescent device in which the interference intensity of red, green, and blue light shows a peak, when the thickness s of the organic layer 15 is in a range of 140 ± 10 nm, the red light of the above-described ITO thickness When the thickness of about 295 ± 10nm for green light, about 225 ± 10nm for green light and about 155 ± 10nm for blue light is selected, the organic layer 15 for the thicknesses d1, d2, d3 of the first electrode 13 is selected. Since the ratio of the thickness s of is as shown in Table 2, it can be seen that the conditional formula shown in Equation 5 is satisfied.

d1 = 295 ± 10 nm d2 = 225 ± 10 (nm) d3 = 155 ± 10 (nm) Thickness of organic layer / thickness of first electrode 0.47 ± 0.3 0.62 ± 0.4 0.90 ± 0.7

The organic electroluminescent device according to the embodiment of the present invention having the first electrode having such a thickness has a high luminous efficiency because the difference in the maximum strength is not large even when a small error occurs in the thickness.

The organic electroluminescent device according to the first embodiment of the present invention, the thickness (d1, d2, d3) of the first electrode 13, the thickness of the hole injection layer 15a and the hole transport layer ( The sum s1 of the thickness of 15b) may be changed, and in this case, Equation 3 may be represented by Equation 6.

When the conditional expression as shown in Equation 6 is satisfied, the organic light emitting display device according to the first embodiment of the present invention exhibits peak intensities of red, green, and blue light, thereby increasing luminous efficiency. In order to find the optimum thickness, an organic light emitting display device according to a first exemplary embodiment of the present invention having the conditions shown in Table 3 is manufactured.

Board First electrode Organic layer Thickness (mm) Refractive index Thickness (mm) Refractive index HIL + HTL EML + ETL Refractive index Thickness (nm) Thickness (nm) Red 0.7 1.516 1.749 80 90 1.785 Green 0.7 1.520 1.841 80 80 1.821 blue 0.7 1.526 1.903 80 60 1.916

In the organic electroluminescent device according to the first embodiment of the present invention having such a condition, the first electrode 13 is made of ITO, and then the sum (s2) of the thicknesses of the light emitting layer 15c and the electron transport layer 15d is calculated. A graph measuring the intensity of each color light while keeping the thickness constant at about 80 nm and changing the thickness of ITO is shown in FIG. 5.

Referring to FIG. 5, when the thickness of ITO is about 40 nm, about 155 nm, and about 270 nm, the intensity of blue light shows a peak. When the thickness of ITO is about 60 nm, about 205 nm, and about 350 nm, the intensity of green light shows a peak. In the case where the thickness of ITO is about 90 nm and about 265 nm, the intensity of red light shows a peak.

To facilitate the fabrication of organic electroluminescent devices in which the intensity of red, green, and blue light peaks, the above-described ITO thickness is about 265 ± 10 nm for red light, about 205 ± 10 nm for green light, and 155 for blue light. When the thickness of about ± 10nm is selected, the ratio of the thickness s of the organic layer 15 to the thicknesses d1, d2, and d3 of the first electrode 13 is as shown in Table 4, It can be seen that the presented conditional expression is satisfied.

d1 = 265 ± 10 (nm) d2 = 205 ± 10 (nm) d3 = 155 ± 10 (nm) Thickness of hole injection layer + thickness of hole transport layer / thickness of first electrode 0.30 ± 0.1 0.39 ± 0.2 0.51 ± 0.4

The organic electroluminescent device according to the first exemplary embodiment of the present invention having the first electrode having such a thickness has a high luminous efficiency since the difference in the maximum strength is not great even when a small error occurs in the thickness.

Second Embodiment of the Present Invention

2A is a cross-sectional view illustrating an organic electroluminescent device according to a second embodiment of the present invention. The organic electroluminescent device according to the second embodiment of the present invention, unlike the organic electroluminescent device according to the first embodiment of the present invention, is characterized in that it further comprises a buffer layer 12 on the upper surface of the substrate 11 do.

Referring to FIG. 2A, the organic electroluminescent device according to the second embodiment of the present invention includes a buffer layer 12 formed in a stripe shape on the substrate 11 and the substrate 11 so as to have a different thickness for each pixel. And a first electrode part including a first electrode 13 formed on the buffer layer 12, an organic layer 15 stacked on the first electrode 13, and an upper layer of the organic layer 15. The second electrode 17 formed in a stripe shape to intersect the first electrode 13 is provided in order.

Reference numeral 18 is formed to be orthogonal to the first electrode 13 so that the first electrode 13 is regularly exposed as the insulating layer. Here, the first electrode 23 is an anode, and the second electrode 27 is a cathode.

The buffer layer 12 is made of a transparent material having a refractive index similar to that of the first electrode 13. To correspond to the thickness variations d1, d2, and d3 of the first electrode 13 as shown in FIG. 1B, the red pixel is formed on the upper surface of the substrate 11, and the green pixels are formed of the buffer layers 12a, 12b of the layer. One layer of the buffer layer 12a is deposited, and no buffer layer is deposited on the blue pixel.

Therefore, in the organic electroluminescent device according to the second embodiment of the present invention, when the distance from the upper surface of the transparent substrate 11 according to Equation 1 to the upper surface of the first electrode 13 is h1, green pixel For h2, and for blue pixels, h3. Since the distance of the upper branch of the first electrode 13 from the upper surface of the transparent substrate 11 is equal to the sum of the thickness of the buffer layer 12 and the thickness of the first electrode 13, Equation 1 is expressed by Equation 7 below. When the condition shown in Equation 7 is satisfied, the intensity of the red, green, and blue light peaks.

In the organic electroluminescent device according to the second exemplary embodiment of the present invention, similar experiment results are shown when the experiments shown in Table 1 and FIG. 4 are performed. Thus, the thickness of the above-described ITO, that is, 295 ± 10 nm for red pixels, and green The buffer layer 12 and the first electrode 13 are manufactured to have a thickness equal to 225 ± 10 nm for pixels and 155 ± 10 nm for blue pixels. At this time, the thickness of the organic layer 15 will be 140nm ± 10nm.

In addition, in the organic electroluminescent device according to the second embodiment of the present invention, when the experiment shown in Table 2 and FIG. 5 shows similar experimental results, the condition shown in Equation 3 is expressed as Equation 8 Can be represented.

When the sum s1 of the thickness of the hole injection layer 15a and the thickness of the hole transport layer 15b is set to 80 ± 10 nm as shown in Table 2, the thickness of the buffer layer 12 and the thickness of the first electrode 13 If the sum of the thicknesses is 265 ± 10 nm for red pixels, 205 ± 10 nm for green pixels, and 155 ± 10 nm for blue pixels, the intensity of red, green, and blue light shows peaks as shown in FIG. 5. .

This principle is equally applicable to the organic electroluminescent device of the top emission type shown in FIGS. 2b and 2c.

Third Embodiment of the Present Invention

2B is a cross-sectional view illustrating an organic electroluminescent device according to a third embodiment of the present invention.

Referring to FIG. 2B, the organic electroluminescent device according to the third embodiment of the present invention includes a substrate 11, a first electrode 13 formed in a predetermined pattern on an upper surface of the substrate 11, and a substrate 11. The organic layer 15 formed by stacking the hole injection layer 15a, the hole transport layer 15b, the light emitting layer 15c and the electron transport layer 15d on the upper surface of the organic layer 15, and formed on the upper surface of the organic layer 15 in a predetermined pattern A transparent second electrode 17 is provided.

The distance from the upper surface of the organic layer 13 where the intensity of red, green, and blue light peaks to the upper surface of the second electrode portion must satisfy Equation 2. Accordingly, the second electrode 17 is formed of a transparent conductive material, three layers 17a, 17b, and 17c for a red pixel, two layers 17a and 17b for a green pixel, and one layer 17a for a blue pixel. And are manufactured such that the thicknesses are j1, j2, and j3, respectively.

Here, since the upper surface of the second electrode portion is the upper surface of the second electrode 17, Equation 2 may be represented by Equation 9 in the organic electroluminescent device according to the third embodiment of the present invention.

Alternatively, in the organic electroluminescent device according to the third embodiment of the present invention, the distance from the top surface of the organic layer 13 to the top surface of the second electrode 17 such that the intensity of red, green, and blue light peaks is expressed by Equation 4 below. It can be formed to satisfy, in this case Equation 4 may be represented by Equation 10.

In the description of the organic electroluminescent device according to the first embodiment of the present invention, the experimental results shown in Tables 1, 2 and 4 described above, and the experimental results shown in Tables 3, 4 and 5 as the third embodiment of the present invention The same applies to the organic electroluminescent device according to the embodiment.

Accordingly, in forming the thicknesses j1, j2, and j3 of the second electrode 17, when the thickness s of the organic layer 15 is 140 ± 10 nm, the red pixel satisfies Equation 9 to 295 ± 10 nm. For example, a green pixel may be manufactured at 225 ± 10nm and a blue pixel at 155 ± 10nm.

Alternatively, if the sum (s) of the hole injection layer 15a and the hole transport layer 15b is 80 ± 10 nm, 265 ± 10 nm for a red pixel, 205 ± 10 nm for a green pixel, and a blue pixel to satisfy Equation 10 In the case of 155 ± 10nm can be formed.

<Fourth embodiment of the present invention>

2C is a cross-sectional view illustrating an organic electroluminescent device according to a fourth embodiment of the present invention. The organic electroluminescent device according to the fourth embodiment of the present invention, unlike the organic electroluminescent device according to the third embodiment of the present invention, has a buffer layer 12 on the upper surface of the second electrode 17.

Referring to FIG. 2C, the organic electroluminescent device according to the fourth embodiment of the present invention includes a substrate 11, a first electrode 13 formed in a predetermined pattern on an upper surface of the substrate 11, and a substrate 11. The organic layer 15 formed by stacking the hole injection layer 15a, the hole transport layer 15b, the light emitting layer 15c and the electron transport layer 15d on the upper surface of the organic layer 15, and formed on the upper surface of the organic layer 15 in a predetermined pattern A second electrode part including a transparent second electrode 17 and a buffer layer 12 formed on an upper surface of the second electrode 17 is provided.

The buffer layer 12 is made of a transparent material having a refractive index similar to that of the second electrode 17. The buffer layer 12 is stacked in two layers 12a and 12b in the case of red pixels and is stacked in one layer 12a in the case of green pixels. It is formed to have j2, and the blue pixel is manufactured to have a thickness j3 without stacking the buffer layer 12.

In order for the intensity of red, green, and blue light to become a peak, the ratio of the thickness of the organic layer 15 and the distance from the upper surface of the organic layer 15 to the upper surface of the second electrode portion must satisfy Equation 2.

In Equation 2, the distance from the top surface of the organic layer 15 to the top surface of the buffer layer 12b may be represented by Equation 11 in the organic electroluminescent device according to the fourth embodiment of the present invention. The thicknesses of the second electrode 17, the organic layer 15, and the buffer layer 12 are adjusted.

Alternatively, in the organic electroluminescent device according to the fourth embodiment of the present invention, the sum of the thicknesses of the hole injection layer 15a and the hole transport layer 15b and the top surface of the organic layer 13 to the top surface of the buffer layer 12b. The ratio of distance is satisfied so that the intensity of the red, green, and blue light peaks so as to satisfy the expression (6), thereby improving the luminous efficiency. Equation 6 may be represented by Equation 12 in the organic electroluminescent device according to the third embodiment of the present invention, so that the hole injection layer 15a, the hole transport layer 15b, and the second electrode 17) and the thickness of the buffer layer 12 is adjusted.

In the description of the organic electroluminescent device according to the first embodiment of the present invention, the experimental results shown in Tables 1, 2 and 4 described above, and the experimental results shown in Tables 3, 4 and 5 are the fourth of the present invention. The same applies to the organic electroluminescent device according to the embodiment.

Accordingly, the sum (l1, l2, l3) of the thickness of the second electrode 17 and the thickness of the buffer layer 12 is such that the red pixel satisfies Equation 11 when the thickness s of the organic layer 15 is 140 ± 10 nm. For 295 ± 10nm, 225 ± 10nm for green pixels, 155 ± 10nm for blue pixels, or if the sum (s) of the hole injection layer (15a) and hole transport layer (15b) is 80 ± 10nm In order to satisfy the requirements, the red pixel may be manufactured at 265 ± 10nm, the green pixel at 205 ± 10nm, and the blue pixel at 155 ± 10nm.

So far, the conditions for causing the intensity of red, blue, and green light peaks in the passive matrix organic electroluminescent device have been described.

Next, in the active matrix organic electroluminescent device, the conditions under which the intensity of the red, blue, and green light peaks are represented by the above-described Equations 1, 2, 3, and 4.

3A to 3D illustrate an organic electroluminescent device of an active matrix driving method including a thin film transistor (TFT). An organic electroluminescent element of an active matrix driving method includes a pixel portion in which an image is displayed, and a driving portion for driving the pixel portion.

Referring to the drawings, in the organic electroluminescent devices according to the fifth to eighth embodiments of the present invention, the pixel portion 20 is insulated including a substrate 21 and a plurality of insulating films on the upper surface of the substrate 21. A layer 30, a first electrode 23 stacked on an upper surface of the insulating layer 30, an organic layer 25 and an organic layer 25 formed on an upper surface of the first electrode 23, and are driven. The second electrode 27 is connected to the 40. Here, the first electrode 23 is an anode, and the second electrode 27 is a cathode.

The driving unit 40 includes a semiconductor layer 41 provided on the substrate 21, a gate electrode 43 positioned to correspond to the upper portion of the semiconductor layer 41, and an intermediate insulating film filling the gate electrode 43. (35), a source electrode (47) for supplying electrodes to both ends of the semiconductor layer (41), and a protective film (34) covering the upper surface of the gate electrode (45) and the gate electrode (45). Reference numeral 37 is a planarization film for flattening the height of the driving unit 40 except for the pixel unit 20 and the connection portion thereof. Reference numeral 26 denotes an opening of the pixel portion 20.

Here, the source electrode 47 is connected to the first electrode 51, and a second electrode 53 positioned to correspond to each other with the insulating layer 32 interposed therebetween is provided under the first electrode 51. ).

<Fifth embodiment of the present invention>

3A is a view illustrating an organic electroluminescent device according to a fifth embodiment of the present invention of a bottom emission method.

The organic electroluminescent device according to the fifth embodiment of the present invention shown in FIG. 3A has a transparent substrate 21 and a first electrode 23 made of a transparent conductive material. In the case of red pixels, three layers 23a, 23b, It is made of 23c) and has a thickness d1. The green pixel is made of two layers 23a and 23b, and the thickness is d2. The blue pixel is made of a single layer 23a and made of a thickness d3.

The thicknesses d1, d2, and d3 of the first electrode 23 may be formed to satisfy Equation 5 or 7 as in the organic electroluminescent device according to the first embodiment of the present invention. The intensity of each color light emitted from the red, green, and blue pixels becomes the peak.

For example, when the refractive index of the insulating layer 30 is different from the refractive index of the first electrode 23, Equation 5 is applied, and when the refractive index of the insulating layer 30 is similar to the first electrode 23, In step 7, the thickness of the insulating layer 30 is substituted instead of the thickness of the buffer layer. Here, only the refractive indexes of the partial insulating films of the first to fourth insulating films 31, 32, 33, and 34 constituting the insulating layer 30, for example, the third and fourth insulating films 33 and 34, are the first electrodes. When the refractive index is similar to that of (23), the sum of the thicknesses of the third and fourth insulating films 33 and 34 is substituted in Equation 8 instead of the buffer layer thickness. This is because when a layer made of a material having a similar refractive index is adjacent to the first electrode 23, light passes through the first electrode 23 and this layer and then is reflected and emitted from a layer having a different refractive index.

In the organic electroluminescent device according to the fifth embodiment of the present invention, since the experimental results shown in Tables 1, 2 and 4 are applicable, if the thickness s of the organic layer 25 is 140 ± 10 nm, Equation 5 To satisfy, the first electrode 23 having a thickness of 295 ± 10 nm for a red pixel, 225 ± 10 nm for a green pixel, and 155 ± 10 nm for a blue pixel may be formed. Similarly, the sum of the thicknesses of the first electrode 23 and the insulating layer 36 may be adjusted to have the same range of thickness as the above-described range so as to satisfy Equation 7 in the thickness of the organic layer 25 in the same range. .

Alternatively, the thicknesses d1, d2, and d3 of the first electrode 23 at which the intensity of the red, green, and blue light peaks satisfy Equation 3, and thus satisfy the conditional expressions of Equation 6 or 8 described above. It can be formed to. However, when the refractive index of the insulating layer 30 is different from the refractive index of the first electrode 23, Equation 6 is applied, and when the refractive index of the insulating layer 30 is similar to the refractive index of the first electrode 23, Equation 8 Is applied but substitutes the thickness of the insulating layer 30 instead of the thickness of the buffer layer.

Here, only the refractive indexes of the partial insulating films of the first to fourth insulating films 31, 32, 33, and 34 constituting the insulating layer 30, for example, the third and fourth insulating films 33 and 34, are the first electrodes. When the refractive index is similar to (23), the sum of the thicknesses of the third and fourth insulating films 33 and 34 is applied instead of the thickness of the buffer layer in Equation (8).

Since the experimental results performed in Tables 3, 4 and 6 are also applicable to the fifth embodiment of the present invention, the thickness of the first electrode 23 or the thickness of the first electrode 23 and the insulating layer 30 is positive. If the sum (s) of the injection layer 15a and the hole transport layer 15b is 80 ± 10 nm, 265 ± 10 nm for a red pixel, 205 ± 10 nm for a green pixel, and 155 ± 10 nm for a blue pixel to satisfy Equation 8. It can be manufactured to be in the range of.

<Sixth embodiment of the present invention>

3B is a cross-sectional view of an organic electroluminescent device according to a sixth embodiment of the present invention.

Referring to FIG. 3B, in the organic electroluminescent device according to the sixth embodiment of the present invention, a buffer layer 36 having a refractive index similar to that of the first electrode 23 is further stacked on the insulating layer 30. have. In the case of red pixels, the buffer layers 36a and 36b of two layers are stacked, and the buffer layer 36a of one layer is stacked in the case of green pixels. In the case of blue pixels, the buffer layers 36 are not stacked. In this case, when the refractive index of the insulating layer 30 is different from the refractive index of the first electrode 23, and when the thickness of the organic layer 25 is constant, the buffer layer 36 is formed on the bottom of the first electrode 23 to provide each pixel. Is to adjust the intensity of the peak.

In the organic electroluminescent device according to the sixth embodiment of the present invention, the ratio of the sum of the thickness of the organic layer 25 and the thickness of the first electrode 23 and the buffer layer 36 may be set to satisfy the equations (7) and (8). have.

In the organic electroluminescent device according to the sixth embodiment of the present invention, since the experimental results shown in Tables 1, 2 and 4 are applicable, when the thickness s of the organic layer 25 is 140 ± 10 nm, the first electrode ( 23) and the sum of the thicknesses of the buffer layer 36 may be 295 ± 10nm for the red pixel, 225 ± 10nm for the green pixel, and 155 ± 10nm for the blue pixel so as to satisfy the equation (7).

In addition, the experimental results shown in Tables 3, 4 and 5 are also applicable, so that the thickness of the first electrode 23 or the thickness of the first electrode 23 and the buffer layer 36 is determined by the hole injection layer 15a and the hole. If the sum (s) of the transport layer 15b is 80 ± 10 nm, it may be manufactured to be in the range of 265 ± 10 nm for red pixels, 205 ± 10 nm for green pixels, and 155 ± 10 nm for blue pixels to satisfy Equation 8. have.

<Seventh embodiment of the present invention>

3C is a cross-sectional view of an organic electroluminescent device according to a seventh embodiment of the present invention.

Referring to FIG. 3C, in the organic electroluminescent device according to the seventh embodiment of the present invention, the second electrode 26 includes three layers 26a, 26b and 26c for a red pixel and two layers 26a and a green pixel. 26b, 26c), and the blue pixel is formed of one layer 26a, and each thickness is formed of j1, j2, and j3.

In the organic electroluminescent device according to the seventh embodiment of the present invention, the thickness of the organic layer 25 and the ratio of the second electrode 26 are set to satisfy Equations 9 and 10, in which case each of red, green, and blue The intensity of color light shows a peak.

Since the experimental results shown in Tables 1, 2, and 4 are applicable, if the thickness s of the organic layer 25 is 140 ± 10 nm, the thickness of the second electrode 26 may satisfy the equation (9). 295 ± 10nm, 225 ± 10nm for green pixels, 155 ± 10nm for blue pixels can be manufactured.

Since the experimental results shown in Tables 3, 4, and 5 are applicable, the thickness of the second electrode 26 is expressed as the sum (s) of the hole injection layer 15a and the hole transport layer 15b is 80 ± 10 nm. In order to satisfy 10, 265 ± 10nm for red pixels, 205 ± 10nm for green pixels, and 155 ± 10nm for blue pixels may be manufactured.

<Eighth embodiment of the present invention>

3D is a cross-sectional view of an organic electroluminescent device according to an eighth embodiment of the present invention.

Referring to FIG. 3D, in the organic electroluminescent device according to the eighth embodiment of the present invention, the buffer layer 36 is formed on the upper surface of the second electrode 26, and in the case of the red pixel, the two layers 36a and 36b are formed. In this case, it is laminated in one layer 36a. In the case of blue pixels, the buffer layers 36 are not stacked. The sum of the thicknesses of the second electrode 26 and the buffer layer 36 is formed of l1, l2, and l3 in red, green, and blue pixels, respectively.

In the organic electroluminescent device according to the eighth embodiment of the present invention, the ratio of the sum of the thickness of the organic layer 25 and the thickness of the second electrode 26 and the buffer layer 36 is set to satisfy Equations 11 and 12, In this case, the intensity of each color light of red, green and blue shows a peak.

Since the experimental results shown in Tables 1, 2, and 4 are applicable, when the thickness s of the organic layer 25 is 140 ± 10 nm, the sum of the thicknesses of the second electrode 26 and the buffer layer 36 is represented by Equation 11 In order to satisfy the requirements, 295 ± 10nm for red pixels, 225 ± 10nm for green pixels, and 155 ± 10nm for blue pixels may be manufactured.

Since the experimental results shown in Tables 3, 4 and 5 are applicable, the sum of the thicknesses of the second electrode 26 and the buffer layer 36 is the sum (s) of the hole injection layer 15a and the hole transport layer 15b. If it is 80 ± 10nm, it can be manufactured to 265 ± 10nm for the red pixel, 205 ± 10nm for the green pixel, 155 ± 10nm for the blue pixel to satisfy the equation (12).

The organic electroluminescent devices according to the first to eighth embodiments of the present invention, in which the intensity of red, green, and blue light peak, have been described.

Hereinafter, an electrode manufacturing method of an organic electroluminescent device according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

6A to 6I are process diagrams showing an example of an electrode manufacturing method of an organic electroluminescent device according to a first embodiment of the present invention. The thickness of the organic electroluminescent device according to an embodiment of the present invention is controlled by three etching processes to form an electrode having a different thickness.

First, as shown in FIG. 6A, an electrode 73 is deposited on the substrate 71. Then, as shown in FIG. 6B, a photosensitive agent 72 is coated on the upper surface of the electrode 73, and a mask of a predetermined pattern ( When the exposure process is performed by placing 73 on the upper portion thereof, the photosensitive agent 72a in the portion covered by the mask 74 is not exposed, and only the photosensitive agent 72b in the portion that is not covered is exposed.

As shown in Fig. 6C, when developed, only the photosensitive agent 72b in the exposed portion is removed. Next, the electrode 73 'is etched using the remaining photosensitive agent 72a as a mask. The first etching process forms electrodes of the same height.

When the photosensitive agent 72 is applied to the upper portion again, an exposure process as shown in FIG. 6D is performed, and then developed, only the photosensitive agent 72b in the exposed portion is removed as shown in FIG. 6E. When the predetermined portion 73b 'of the electrode 73b of the portion where the photosensitive agent 72b is removed is etched, the stripe electrodes 73a, 73b, and 73c of the type shown in FIG. 6F are formed.

The second etching process forms electrodes of different heights.

As shown in FIG. 6G, when the photosensitive agent 72 is applied to the upper portion again, the light is exposed again and developed, the exposed portion 72b of the photosensitive agent 72 is removed and the photosensitive agent 72 is removed as shown in FIG. 6H. When the electrode 73c of the removed portion is etched to remove the predetermined portion 73c ', electrodes 73a, 73b, and 73c having different thicknesses are formed as shown in FIG. 6I. When the etching process to the last third is performed, three kinds of electrodes having different heights are formed.

The shape of the electrodes 73a, 73b, and 73c may be the first electrode 13 of which the thickness varies according to each pixel of red, green, and blue in the organic electroluminescent device according to the first embodiment of the present invention. . This same process can be applied to the organic electroluminescent device according to the third, fifth, and seventh embodiments of the present invention. In this case, the substrate 71 may be an organic layer, or the electrode 73 may be a second electrode.

7A to 7O are process charts showing another example of the electrode manufacturing method of the organic electroluminescent device according to the first embodiment of the present invention. In the electrode manufacturing method of the organic electroluminescent device according to an embodiment of the present invention, the thickness of the electrode of each red, blue, green pixel is adjusted by performing three deposition and etching processes of the electrode.

First, as shown in FIG. 7A, the first electrode layer 83 is deposited on the upper surface of the substrate 81, and then the photosensitive agent 82 is applied as shown in FIG. 7B, and then exposed and developed as shown in FIG. 7C. As shown, only the photosensitive agent 82b of the exposed portion is removed. When the first electrode 83a ′ in the portion where the photosensitive agent 82 is removed is etched and removed, a first electrode 83a having a stripe shape is formed as illustrated in FIG. 7D. As shown in FIG. 7E, when the photosensitive agent 82a on the upper side is removed, an electrode having a predetermined height is formed in a stripe shape.

Next, as shown in FIG. 7F, a second electrode 83b of the same material as the first electrode 83a is deposited on the first electrode 83a. As shown in FIG. 7G, again applying, exposing and developing the photosensitive agent 82 thereon, the photosensitive agent 82 is patterned in a stripe shape as shown in FIG. 7H.

When the second electrode 83b ′ of the portion where the photosensitive agent 82 is removed is etched and removed, the second electrode 83b ′ is formed as shown in FIG. 7I, and when the photosensitive agent 82a positioned above the second electrode 83b is removed. As shown in FIG. 7J, the first electrode 83a and the second electrode 83b are formed in a stripe shape.

When this step is completed, two kinds of electrodes having different heights are formed.

In order to form three types of electrodes having a height, a third electrode 83c is deposited on the second electrode 83b as shown in FIG. 7K, and a photosensitive agent 82 is applied as shown in FIG. 7L. The exposure and development steps are then performed. As shown in FIG. 7M, when the third electrode 83c of the portion where the photosensitive agent 82 is removed is etched, the shape is as shown in FIG. 7N, and when the photosensitive agent 82a is removed, as shown in FIG. 7O. Similarly, stripe-shaped electrodes 83 having different thicknesses are formed.

In the case of forming the second electrode 83b and the third electrode 83c as a buffer layer, the present process is applied to fabricate the electrodes of the organic electroluminescent devices according to the second, fourth, sixth, and eighth embodiments of the present invention. Of course, the present process may be applied to manufacture the electrodes of the organic electroluminescent device according to the third, fifth and seventh embodiments of the present invention.

An organic electroluminescent device according to an embodiment of the present invention, the thickness of the organic layer or the sum of the thickness of the hole injection layer and the hole transport layer, the thickness of the electrode or the thickness of the electrode and buffer layer so that the intensity of the red, green, blue light peaks By setting the sum ratio to a value within a predetermined range, the luminous efficiency can be increased and the brightness of each light can be improved. In particular, despite the deposition of the HIL and HTL film thickness into the RGB common layer, the peak of the optical interference spectrum can be adjusted to be at the peak position of the RGB three colors, so the manufacturing process is easy and the efficiency of the RGB is maximized, resulting in low power consumption, Long lifespan is possible. In addition, even if a large substrate is manufactured, deterioration of panel characteristics based on nonuniformity of film thickness can be minimized.

While many details are set forth in the foregoing description, they should be construed as illustrative of preferred embodiments, rather than to limit the scope of the invention. For example, a person having ordinary knowledge in the technical field to which the present invention belongs may use the red, green, and blue pixels of the red, green, and blue pixels such that the intensity of each light of the red, green, and blue peaks as described above. The thickness of the electrode may be formed to a thickness different from the thickness presented. In the exemplary embodiment of the present invention, although the thickness of the electrode of the red pixel is the thickest and the thickness of the electrode of the blue pixel is formed the thinnest, it may be formed differently. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the technical spirit described in the claims.

As described above, an advantage of the organic electroluminescent device according to the present invention is that each intensity of the red, green, and blue light peaks to increase the luminous efficiency and to reduce the change in the luminous color, thereby improving image quality with improved brightness and contrast. It can be provided.

Claims (44)

Transparent substrate; A first electrode part including a transparent first electrode formed in a predetermined pattern on an upper surface of the transparent substrate; An organic layer in which a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are stacked in order on an upper surface of the first electrode part; And A second electrode formed in a predetermined pattern on an upper surface of the organic layer; The ratio of the distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion and the thickness of the organic layer satisfies the following equation so that the intensity of the red, green, and blue light peaks. . Transparent substrate; An organic layer including a first electrode part including a transparent first electrode formed in a predetermined pattern on an upper surface of the transparent substrate, and a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer sequentially stacked on an upper surface of the first electrode part; And a second electrode part formed on a top surface of the organic layer in a predetermined pattern. And And a driver including a thin film transistor for driving the first electrode. The ratio of the distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion and the thickness of the organic layer satisfies the following equation so that the intensity of the red, green, and blue light peaks. . The method according to claim 1 or 2, And the first electrode part further comprises a transparent buffer layer having a refractive index similar to that of the first electrode on a bottom surface of the first electrode. The method according to claim 1 or 2, The organic layer is an organic electroluminescent device, characterized in that having a thickness of 140 ± 10 nm. The method of claim 3, wherein The organic layer is an organic electroluminescent device, characterized in that having a thickness of 140 ± 10 nm. The method of claim 4, wherein The distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion has an organic light emitting device having a thickness of 295 ± 10 nm so that the intensity of the red light peaks. The method of claim 5, wherein The distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion has an organic light emitting device having a thickness of 295 ± 10 nm so that the intensity of the red light peaks. The method of claim 4, wherein The distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion has an thickness of 225 ± 10 nm so that the intensity of the green light peaks. The method of claim 5, wherein The distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion has an thickness of 225 ± 10 nm so that the intensity of the green light peaks. The method of claim 4, wherein The distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion has an thickness of 155 ± 10nm so that the intensity of the blue light peaks. The method of claim 5, wherein The distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion has an thickness of 155 ± 10nm so that the intensity of the blue light peaks. Board; A first electrode formed on the upper surface of the substrate in a predetermined pattern; An organic layer in which a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are sequentially stacked on an upper surface of the first electrode; And And a second electrode part including a transparent second electrode formed in a predetermined pattern on an upper surface of the organic layer. The ratio of the distance from the upper surface of the organic layer to the upper surface of the second electrode portion, and the thickness of the organic layer satisfies the following equation so that the intensity of the red, green, and blue peaks. Board; A first electrode formed in a predetermined pattern on an upper surface of the substrate, an organic layer in which a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are sequentially stacked on an upper surface of the first electrode, and a predetermined pattern on an upper surface of the organic layer A pixel portion including a second electrode portion including a transparent second electrode formed of the first electrode portion; And And a driver including a thin film transistor for driving the second electrode. The ratio of the distance from the upper surface of the organic layer to the upper surface of the second electrode portion, and the thickness of the organic layer satisfies the following equation so that the intensity of the red, green, blue light peaks. The method of claim 12 or 13, The second electrode unit, the organic electroluminescent device further comprises a transparent buffer layer having a refractive index similar to the second electrode on the upper surface of the second electrode. The method according to claim 12 or 13, The organic layer is an organic electroluminescent device, characterized in that having a thickness of 140 ± 10 nm. The method of claim 14, The organic layer is an organic electroluminescent device, characterized in that having a thickness of 140 ± 10 nm. The method of claim 15, The distance from the upper surface of the organic layer to the upper surface of the second electrode portion is an organic light emitting device, characterized in that 295 ± 10 nm so that the intensity of the red light peaks. The method of claim 16, The distance from the upper surface of the organic layer to the upper surface of the second electrode portion is an organic light emitting device, characterized in that 295 ± 10 nm so that the intensity of the red light peaks. The method of claim 15, The distance from the upper surface of the organic layer to the upper surface of the second electrode portion is an organic electroluminescent device, characterized in that the intensity of the green light is a peak of 225 ± 10 nm. The method of claim 16, The distance from the upper surface of the organic layer to the upper surface of the second electrode portion is an organic electroluminescent device, characterized in that the intensity of the green light is a peak of 225 ± 10 nm. The method of claim 15, And a distance from an upper surface of the organic layer to an upper surface of the second electrode part is 155 ± 10 nm such that the intensity of the blue light becomes a peak. The method of claim 16, And a distance from an upper surface of the organic layer to an upper surface of the second electrode part is 155 ± 10 nm such that the intensity of the blue light becomes a peak. Transparent substrate; A first electrode part including a transparent first electrode formed in a predetermined pattern on an upper surface of the transparent substrate; An organic layer in which a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are sequentially stacked on an upper surface of the first electrode part; And A second electrode formed in a predetermined pattern on an upper surface of the organic layer; The ratio of the distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion and the sum of the thicknesses of the hole injection layer and the hole transport layer satisfies the following equation so that the intensity of red, green, and blue light becomes a peak. An organic electroluminescent device, characterized in that. Transparent substrate; An organic layer including a first electrode part including a transparent first electrode formed in a predetermined pattern on an upper surface of the transparent substrate, and a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer sequentially stacked on an upper surface of the first electrode part; And a second electrode part formed on a top surface of the organic layer in a predetermined pattern. And And a driver including a thin film transistor for driving the first electrode. The ratio of the distance from the upper surface of the transparent substrate to the upper surface of the first electrode portion and the thickness of the organic layer satisfies the following equation so that the intensity of the red, green, and blue light peaks. . The method of claim 23 or 24, The first electrode unit, the organic electroluminescent device, characterized in that further comprising a transparent buffer layer having a refractive index similar to the first electrode on the bottom of the first electrode. The method of claim 23 or 24, The sum of the thicknesses of the hole transport layer and the hole injection layer has an thickness of 80 ± 10 nm. The method of claim 25, The sum of the thicknesses of the hole transport layer and the hole injection layer has an thickness of 80 ± 10 nm. The method of claim 23 or 24, And a distance from an upper surface of the transparent substrate to an upper surface of the first electrode part is 265 ± 10 nm so that the intensity of the red light becomes a peak. The method of claim 25, And a distance from an upper surface of the transparent substrate to an upper surface of the first electrode part is 265 ± 10 nm so that the intensity of the red light becomes a peak. The method of claim 26, And a distance from an upper surface of the transparent substrate to an upper surface of the first electrode part is 205 ± 10 nm so that the intensity of the green light becomes a peak. The method of claim 27, And a distance from an upper surface of the transparent substrate to an upper surface of the first electrode part is 205 ± 10 nm so that the intensity of the green light becomes a peak. The method of claim 26, And a distance from an upper surface of the transparent substrate to an upper surface of the first electrode portion is 155 ± 10 nm such that the intensity of the blue light becomes a peak. The method of claim 27, And a distance from an upper surface of the transparent substrate to an upper surface of the first electrode portion is 155 ± 10 nm such that the intensity of the blue light becomes a peak. Board; A first electrode formed on the upper surface of the substrate in a predetermined pattern; An organic layer in which a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are sequentially stacked on an upper surface of the first electrode; And a second electrode part including a transparent second electrode formed in a predetermined pattern on an upper surface of the organic layer. The ratio of the distance from the upper surface of the organic layer to the upper surface of the second electrode portion and the sum of the thicknesses of the hole injection layer and the hole transport layer satisfies the following equation so that the intensity of red, green, and blue light peaks. An organic electroluminescent element. Board; A first electrode formed in a predetermined pattern on an upper surface of the substrate, an organic layer in which a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer are sequentially stacked on an upper surface of the first electrode, and a predetermined pattern on an upper surface of the organic layer A pixel portion including a second electrode portion including a transparent second electrode formed in the shape; And And a driver including a thin film transistor for driving the second electrode. The ratio of the distance from the upper surface of the organic layer to the upper surface of the second electrode portion and the sum of the thickness of the hole injection layer and the hole transport layer satisfies the following equation so that the intensity of red, green, and blue becomes a peak. An organic electroluminescent element. The method of claim 34 or 35, The second electrode unit, the organic electroluminescent device further comprises a transparent buffer layer having a refractive index similar to the second electrode on the upper surface of the second electrode. The method of claim 34 or 35, The sum of the thicknesses of the hole transport layer and the hole injection layer has an thickness of 80 ± 10 nm. The method of claim 36, The sum of the thicknesses of the hole transport layer and the hole injection layer has an thickness of 80 ± 10 nm. The method of claim 37, And a distance from an upper surface of the organic layer to an upper surface of the second electrode portion is 265 ± 10 nm such that the intensity of the red light is a peak. The method of claim 38, And a distance from an upper surface of the organic layer to an upper surface of the second electrode portion is 265 ± 10 nm such that the intensity of the red light is a peak. The method of claim 37, And a distance from an upper surface of the organic layer to an upper surface of the second electrode part is 205 ± 10 nm such that the intensity of the green light becomes a peak. The method of claim 38, And a distance from an upper surface of the organic layer to an upper surface of the second electrode part is 205 ± 10 nm such that the intensity of the green light becomes a peak. The method of claim 37, And a distance from an upper surface of the organic layer to an upper surface of the second electrode part is 155 ± 10 nm so that the intensity of the blue light becomes a peak. The method of claim 38, And a distance from an upper surface of the organic layer to an upper surface of the second electrode part is 155 ± 10 nm so that the intensity of the blue light becomes a peak.